Plug cutter having an ejector



Oct. 28, 1952 c. F. SCHAUMLEFFEL 2,615,245

PLUG CUTTER HAVING AN EJECTOR Filed Feb. 8, 1949 FIG. 2

12 H i ihilii I FIG 3 IN VEN TOR.

C. F. SCHAUMLEFFEL ATTO RN EY Patented Oct. 28, 1952 i-qunirso-srAriis TPATE NT OFFICE;

' PLUG CUTTER HAVING AN. EJEo'ron Charles F. Schaumleffel, Zanesville, omd" Application February 8, 1949, Serial No. 75,180

This invention relates to the manufacture of pottery and more particularly to a device for producing a hole in the pottery during the production of the same prior to its final hardening.

The invention is particularly useful in providing holes in lamp bases to accommodate the electrical wiring or to permit passage of the usual pipe structure which holds the socket. It is also useful in producing holes in pin-up lamps, teapots and the like, produced in clay.

In the production of various and sundry items including those enumerated, it is desirable to provide openings for various purposes while the pottery is in green condition, prior to the final hardening and finishing.

It is an object of the invention to provide a simple, inexpensive hole cutting device which can be easily operated for removing a plug to provide a hole in crockery during its manufacture and from which the removed plug can be easily expelled.

Further objects and advantages of the invention will be apparent from the following description taken in conjunction with the accompanying drawings, wherein:

Fig. 1 is an elevation of the invention with which we are concerned;

Fig. 2, a longitudinal view in section; and v Fig. 3, a similar view with the parts in ejecting position.

Briefly stated the invention comprises a preferably knurled sleeve which is relatively thin at one extremity and is'notched or serrated to provide a cutting tool which, when rotated in a clockwise direction after partial insertion into the plastic material, will produce the desired cut or hole in pottery or the like prior to its final hardening, the thick or knurled portion providing a good hand grip. A plunger or ejector is mounted within the sleeve and comprises a pair of spaced plugs, one of which projects from the end of the sleeve remote from the cutting portion, such plugs being connected by means of a threaded rod to which the plugs are locked by means of pins. A helical spring is disposed between one of the spaced plugs and a collar fixedly secured within the sleeve for maintaining the plunger in its retracted position.

With continued reference to the drawings, the device of the present invention includes a sleeve having a knurled gripping portion l0 and a reduced reaming or cutting end ll provided with serrations l2 forming cutting teeth 13. the knurled gripping portion I0 is gripped and rotated in a clockwise direction the forward or When 1 Claim. (Cl. 30130) 2 axially disposed edges or teeth :will cut into and through a clay body and, if the wall is not thicker than substantially the depth of the serrations [2, a plug of clay will be removed. In order to dispose of this plug of clay, an ejecting member 14 corresponding substantially to the configuration of the interior of the sleeve is mounted for reciprocation therein. The ejecting member I4 is threaded on one end of a rod or stem l5, the other end of which is threadedly connected with a manipulating head or portion l6 and pins I1 and 18 extend through the members l4 and I6 and respective ends of rod I5 for locking the parts together.

In order to maintain the assembly of the ejecting member and the manipulating head and the rod connecting the same within the sleeve or casing for these parts, a ring or collar I9 is secured within the sleeve, between the members l4 and Hi. This collar may be secured in any desired manner; in the present instance the sleeve is heated and the collar inserted when cold into the heated sleeve so that when the sleeve cools it will shrink and tightly grip the collar. Also, to maintain the operating head It; in the position shown in Fig. 2, a spring 20 is confined between the collar l9 and the inner end of the operating head, such spring surrounding the rod l5 and having an enlarged end coil bearing against said collar.

Holes can be easily made in green or unfinished pottery with the above described relatively simple device, which consists of an outer sleeve having cutting teeth on one end, an ejector and an opperating head connected by a rod, the assembly of which is maintained in definite position within the sleeve by means of a spring. The device can be easily assembled or taken apart, and has no complex parts that may get out of order or require other attention.

It will be obvious to those skilled in the art A plug cutter comprising a sleeve having a portion for facilitating gripping of the same and a reduced portion with cutting teeth at its end, means for ejecting a plug cut by said teeth comprising spaced cylindrical members reciprocable within said sleeve, a rod having an end connected to one of said cylindrical members and its other 3 end connected to the other of said cylindrical members, means locking said rodto each of said cylindrical members, a collar fixed within said sleeve between said spaced cylindrical members, and a spring surrounding said rod and extending between said collar and said cylindrical member remote fromsaid teeth for urging said ejecting means towards the retracted position, the cylindrical member engagedby said spring being ex-' tended beyond the end of the sleeve to form an operating head against which pressure may be applied to move the plug ejecting means axially within said sleeve for expelling a plug cut by said teeth.

CHARLES F. sensor/mam. v 15 4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 230,294 Lincoln July 20, 1880 1,352,756 Levy Sept. 14, 1920 1,940,438 Stowell Dec. 19, 1933 10 2,034,490 Schnack 'Mar. 17, 1936 

